一元二次方程x2-3x-1=0与x2-x-3=0的所有实数根之和为( )A.2 发布时间:2017-04-26 08:36 │ 来源:www.tikuol.com 题型:选择题 问题: 一元二次方程x2-3x-1=0与x2-x-3=0的所有实数根之和为( )A.2B.-4C.4D.3
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